<template>
  <div class="home-page">
    <div class="banner">
      <div class="container">
        <h1 class="logo-font">conduit</h1>
        <p>A place to share your knowledge.</p>
      </div>
    </div>

    <div class="container page">
      <div class="row">
        <div class="col-md-9">
          <div class="feed-toggle">
            <ul class="nav nav-pills outline-active">
              <li v-if="user" class="nav-item">
                <nuxt-link class="nav-link" exact="" :class="{active:tab==='your_feed'}" :to="{name:'home',query:{tab:'your_feed'}}">Your Feed</nuxt-link>
              </li>
              <li class="nav-item">
                <nuxt-link class="nav-link" exact="" :class="{active:tab==='global_feed'}" :to="{name:'home',query:{tab:'global_feed'}}">Global Feed</nuxt-link>
              </li>
              <li v-if="tag" class="nav-item">
                <nuxt-link class="nav-link" exact="" :class="{active:tab==='tag'}" :to="{name:'home',query:{tab:'tag',tag,tag}}">{{tag}}</nuxt-link>
              </li>
            </ul>
          </div>

          <template v-if="articles.length">
            <div
              class="article-preview"
              v-for="article in articles"
              :key="article.slug"
            >
              <div class="article-meta">
                <nuxt-link
                  class="author"
                  :to="`/profile/${article.author.username}`"
                >
                  <img :src="article.author.image ? article.author.image : 'https://static.productionready.io/images/smiley-cyrus.jpg'" />
                </nuxt-link>
                <div class="info">
                  <nuxt-link
                    class="author"
                    :to="`/profile/${article.author.username}`"
                  >
                    {{ article.author.username }}
                  </nuxt-link>
                  <span class="date">{{ article.createdAt | date('MMM DD,YYYY') }}</span>
                </div>
                <button
                  class="btn btn-outline-primary btn-sm pull-xs-right"
                  :class="{ active: article.favorited }"
                  @click="onFavorite(article)"
                  :disabled='article.favoriteDisabled'
                >
                  <i class="ion-heart"></i> {{ article.favoritesCount }}
                </button>
              </div>
              <nuxt-link
                :to="{
                  name: 'article',
                  params: {
                    slug: article.slug,
                  },
                }"
                class="preview-link"
              >
                <h1>{{ article.title }}</h1>
                <p>{{ article.description }}</p>
                <span
                  @click="
                    $router.push({
                      name: 'article',
                      params: {
                        slug: article.slug,
                      },
                    })
                  "
                  >Read more...</span
                >
              </nuxt-link>
            </div>
          </template>
          <template v-else>
            <div class="article-preview">
              No articles are here... yet.
            </div>
          </template>

          <nav>
            <ul class="pagination">
              <li class="page-item " :class="{active:item === page}" v-for="item in totalPage" :key="item">
                <nuxt-link class="page-link" :to="{name:'home',query:{page:item,tag:$route.query.tag,tab:tab} }">{{item}}</nuxt-link>
              </li>
            </ul>
          </nav>
        </div>

        <div class="col-md-3">
          <div class="sidebar">
            <p>Popular Tags</p>

            <div class="tag-list">
              <nuxt-link :to="{name:'home',query:{tab:'tag',tag:item}}" class="tag-pill tag-default" v-for="item in tags" :key="item">{{item}}</nuxt-link>
            </div>
          </div>
        </div>

      </div>
      
    </div>
  </div>
</template>
<script>
import { getArticles, getFeedArticles ,addFavorite,deleteFavorite} from "@/api/article";
import {getTags} from '@/api/tag'
import {mapState} from 'vuex'

export default {
  name: "HomeIndex",

  async asyncData({ query, store}) {
    // console.log(store);
    const page = Number.parseInt(query.page || 1);
    const limit = 20;
    const {tag} = query
    const tab = query.tab || 'global_feed'
    const loadArticles = (store.state.user && tab==="your_feed") ? getFeedArticles : getArticles
    const [articleRes,tagRes] = await Promise.all([
      loadArticles({
        limit, // 每页大小
        offset: (page - 1) * limit,
        tag
      }),
      getTags()
    ])
    const {articles,articlesCount} =articleRes.data
    const {tags}=tagRes.data
    articles.forEach(article => article.favoriteDisabled=false);
    // console.log(articles)
    return {
      tags,
      limit,
      page,
      articlesCount,
      articles,
      tag,
      tab
    };
  },
  watchQuery:['page','tag','tab'],
  computed:{
    ...mapState(['user']),
    totalPage () {
      return Math.ceil(this.articlesCount / this.limit)
    }
  },
  methods:{
    async onFavorite(article){
      // console.log(article)
      article.favoriteDisabled=true
      if(article.favorited){
        await deleteFavorite(article.slug)
        article.favorited=false
        article.favoritesCount += -1
      }else{
        await addFavorite(article.slug)
        article.favorited=true
        article.favoritesCount += 1
      }
      article.favoriteDisabled=false
    }
  }
};
</script>
<style>
</style>